The purpose of this thesis work is to evaluate how the physical behaviour of a pipe bend is affected by the pipe bending procedure. Effects such as initial ovalization, thinning, thickening and plastic hardening from the bending procedure are examined and the mechanical properties of pipe bends containing these effects are investigated. This has been evaluated by creating a detailed Finite Element model of a pipe that is being bent. Then the differences compared to a bent tube in a virgin state, so called Elbow elements and an analytical in-house program have been evaluated. The virgin state refers to a model of a pipe that is bent from the beginning, thus having a homogeneous thickness and not containing any plastic hardening. The Elbow element is a calculationally cheap element, specially developed for accurate calculations of pipe bends in an initially virgin state. The goal with the thesis work is to get a better picture of what happens to a pipe as it is being bent, how this affects the mechanical properties and to evaluate the possibility to develop an easy method for taking these effects into account when using the Elbow element. This report describes the layout of the work and how the detailed FE-model has been constructed. One step to being able to use the Elbow element with respect to changes in shape and plastic hardening from the manufacturing process has been presented, the differences are though considered being too big to be able to use the Elbow elements with enough confidence in the results. The problems that remain are presented and discussed and proposals for further work are presented.

This work is based on qualitative interviews with four educationists who before their university studies lack education in their own field of work. The study aims to explore how higher learning influenced and affected these people. As a theoretical point of view the concept of implicit learning and Aristotle’s epistemological approach was used. The study gives an idea that the concept of knowledge is advanced and can go from practical experience to more theoretical understandings. The result of the study shows, despite some criticism on the standard of the education, that the subjects proved to have developed understanding in reflection, communication and personal awareness. In addition this kind of comprehension can be hidden from us and therefore difficult to understand and explain.

Recent studies show that when words are correlated with the colours they are printed in (e.g., MOVE is presented 75% of the time in blue), colour identification is faster when the word is presented in its expected colour (MOVE in blue) than in an unexpected colour (MOVE in green). The present series of experiments explored the possible mechanisms involved in this colour-word contingency learning effect. Experiment 1 demonstrated that the effect was already present after 18 learning trials. During subsequent unlearning, the effect extinguished equally rapidly, suggesting that only a handful of the most recently encountered trials are used to predict responses. Two reanalyses of data from Schmidt, Crump, Cheesman, and Besner (2007) ruled out an account of the effect in terms of stimulus repetitions. Experiments 2 and 3 demonstrated that participants who carry a memory load do not show a contingency effect, supporting the hypothesis that limited-capacity resources are used to retrieve a small number of trial memories in order to prepare a response. Experiment 4 demonstrated that memory resources are required for both storage and retrieval processes.

Past research suggests that members of devalued groups recognize their group is discriminated against. Do the implicit responses of members of these groups demonstrate the same pattern? I argue that they do not and that this is due to a motivated protection of members of devalued groups’ social identity. Study 1 demonstrates that, at an explicit level African-Canadians recognize that their group is discriminated against, but at an implicit level African-Canadians think that most people like their group to a greater extent than do European-Canadians. Study 2 replicates this implicit finding but demonstrates that devalued and majority groups do not have different implicit normative regard about a non-devalued group. Study 3 again replicates the implicit finding with Muslim participants while demonstrating that, when affirmed, this group difference disappears. Study 4 demonstrates that implicit normative regard can predict collective action over and above implicit attitudes and explicit normative regard. The implications for social identity theory and collective action are discussed.

Surface reconstruction of anatomical structures is an integral part of medical modeling. Contour information is extracted from serial cross-sections of tissue data and is stored as "slice" files. Although there are several reasonably efficient triangulation algorithms that reconstruct surfaces from slice data, the models generated from them have a jagged or faceted appearance due to the large inter-slice distance created by the sectioning process. Moreover, inconsistencies in user input aggravate the problem. So, we created a method that reduces inter-slice distance, as well as ignores the inconsistencies in the user input. Our method called the piecewise weighted implicit functions, is based on the approach of weighting smaller implicit functions. It takes only a few slices at a time to construct the implicit function. This method is based on a technique called variational interpolation. <p> Other approaches based on variational interpolation have the disadvantage of becoming unstable when the model is quite large with more than a few thousand constraint points. Furthermore, tracing the intermediate contours becomes expensive for large models. Even though some fast fitting methods handle such instability problems, there is no apparent improvement in contour tracing time, because, the value of each data point on the contour boundary is evaluated using a single large implicit function that essentially uses all constraint points. Our method handles both these problems using a sliding window approach. As our method uses only a local domain to construct each implicit function, it achieves a considerable run-time saving over the other methods. The resulting software produces interpolated models from large data sets in a few minutes on an ordinary desktop computer.

Mathematical models of electric activity in cardiac tissue are becoming increasingly powerful tools in the study of cardiac arrhythmias. Considered here are mathematical models based on ordinary differential equations (ODEs) and partial differential equations (PDEs) that describe the behaviour of this electrical activity. Generating an efficient numerical solution of these models is a challenging task, and in fact the physiological accuracy of tissue-scale models is often limited by the efficiency of the numerical solution process. In this thesis, we discuss two sets of experiments that test ideas for making the numerical solution process more efficient. In the first set of experiments, we examine the numerical solution of four single cell cardiac electrophysiological models, which consist solely of ODEs. We study the efficiency of using implicit-explicit Runge-Kutta (IMEX-RK) splitting methods to solve these models. We find that variable step-size implementations of IMEX-RK methods (ARK3 and ARK5) that take advantage of Jacobian structure clearly outperform most methods commonly used in practice for two of the models, and they outperform all methods commonly used in practice for the remaining models. In the second set of experiments, we examine the solution of the bidomain model, a model consisting of both ODEs and PDEs that are typically solved separately. We focus these experiments on numerical methods for the solution of the two PDEs in the bidomain model. The most popular method for this task, the Crank-Nicolson method, produces unphysical oscillations; we propose a method based on a second-order L-stable singly diagonally implicit Runge-Kutta (SDIRK) method to eliminate these oscillations.<p> We find that although the SDIRK method is able to eliminate these unphysical oscillations, it is only more efficient for crude error tolerances.

Tidigare forskning har visat att implicita och explicita attityder formas och förändras oberoende av varandra, samt att allt fler politiker använder sig av sociala medier för att nå ut till sina väljare. Denna studie syftade till att undersöka hur deltagarnas implicita och explicita attityder, gentemot två fiktiva politiker, påverkas av traditionella och sociala medier. I studien användes en experimentell mellangruppsdesign där deltagarna slumpmässigt fördelades till olika betingelser. Dessa bestod av positiva och negativa nyhetsitems från dels traditionella dels sociala medier. I undersökningen, som genomfördes på internet, deltog 126 personer. För att mäta deltagarnas attitydförändringar användes dels ett Implicit Association Test (IAT), dels ett explicit frågeformulär. Traditionella media påverkade explicita attityder signifikant.

<p>Despite recent evidence that infants under one year of age have implicit understanding of theory of mind, three-year-old children repeatedly fail in traditional false belief tasks. A serious of 4 studies investigated two possible sources of errors. First, children's comprehension of theory of mind questions was tested in an elicited imitation task. Second, their understanding of mental events was measured using anticipatory eye movements in non-verbal tasks. Results showed that young children's performance in verbal false belief tasks is limited by their understanding of linguistic representations of beliefs and their ability to monitor mental states in real-time. This implies the limitations of young children in keeping track of complex social events in real time and in understanding language conventions in real time.</p> / Dissertation

Under typical between stimulus dual-task conditions, implicit sequence learning typically suffers, except under within stimulus conditions, where the stimuli for both tasks are the same. This finding is inconclusive, given that it has not been replicated and the study under which it was obtained was methodologically flawed. The finding also seemed to contradict the psychological refractory period finding that simultaneous presentation of the two task stimuli will result in performance decrements. Two experiments were conducted to test the effect of within stimulus presentation in a dual-task implicit learning task. In Experiment 1, within stimulus presentation resulted in improved sequence learning, relative to between stimulus presentation. The second experiment did not show an effect of response selection load under within stimulus presentation conditions. The findings suggest that implicit learning can occur under attentionally demanding conditions, but that the incidental task structure to be learned should be comprised of stimuli that are already attended during primary task processing.

Efforts to develop an empirically derived typology of a major component of the implicit aggressive personality are described. A variety of samples (from both student and work populations) completed the Conditional Reasoning Test for Aggression (CRT-A; James, McIntyre, Glisson, Bowler, and Mitchell, 2004; James et al., 2005). Individual scores on the CRT-A were analyzed utilizing cluster analytic methodology in order to develop a typology of the key defense mechanisms used by the implicit aggressive personality. The resulting clusters were analyzed using affirmation analysis (Feild and Schoenfeldt, 1975) to test the reliability of each. A useful system for classifying the implicit aggressive personality resulted from this endeavor. It is expected that both scientists and practitioners can use this typology as a means for classifying aggressive individuals. Implications include the development of an organizing framework facilitating scientific communication in research on the aggressive personality as well as a classification system for organizations to identify those applicants and incumbents that might be potentially detrimental to the well-being of their coworkers.